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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Reconciliation of basic earnings (loss) per share to diluted earnings (loss) per share
The reconciliation of basic earnings (loss) per share to diluted earnings (loss) per share is shown in the following table.
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
(millions, except per-share data)
2013
 
2012
 
2013
 
2012
Income (loss) from continuing operations
$
24

 
$
(30
)
 
$
51

 
$
(118
)
(Loss) income from discontinued operations
(1
)
 
1

 
(1
)
 
5

Net income (loss)
$
23

 
$
(29
)
 
$
50

 
$
(113
)
 
 
 
 
 
 
 
 
Average common shares
108.6

 
107.4

 
108.5

 
106.1

Dilutive RSUs, MSUs, performance shares and stock options
2.4

 
—

 
2.6

 
—

Average diluted common shares
111.0

 
107.4

 
111.1

 
106.1

 
 
 
 
 
 
 
 
Basic earnings (loss) per average common share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.23

 
$
(0.29
)
 
$
0.48

 
$
(1.11
)
(Loss) income from discontinued operations
(0.01
)
 
0.01

 
(0.01
)
 
0.04

Net income (loss)
$
0.22

 
$
(0.28
)
 
$
0.47

 
$
(1.07
)
 
 
 
 
 
 
 
 
Diluted earnings (loss) per average common share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.22

 
$
(0.29
)
 
$
0.47

 
$
(1.11
)
(Loss) income from discontinued operations
(0.01
)
 
0.01

 
(0.01
)
 
0.04

Net income (loss)
$
0.21

 
$
(0.28
)
 
$
0.46

 
$
(1.07
)
Schedule of antidilutive securities excluded from computation of earnings per share
Stock options, RSUs, MSUs and performance shares that were not included in the computation of diluted earnings (loss) per share for those periods because their inclusion would be anti-dilutive were as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
(millions, common shares)
2013
 
2012
 
2013
 
2012
Stock options, RSUs, MSUs and performance shares
2.0

 
7.9

 
2.2

 
8.0